Gamma decay
= Gamma decay
{title2=$E_\gamma\simeq E_i-E_f$}
<Gamma decay> is electromagnetic <nuclear de-excitation> by <photon> emission. It preserves <mass number> and <atomic number>, while changing the nuclear state. <Angular momentum> and <parity> constrain the allowed radiation multipoles. The <gamma ray> topic is broader than this nuclear process.